Re: [Xen-devel] Xen Hypervisor start fail when system memory more than 64GB, and free xen memory over 32 GB

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Mon, Aug 16, 2010 at 12:55:55PM +0300, Pasi Kärkkäinen wrote:
> On Mon, Aug 16, 2010 at 05:46:24PM +0800, benian wrote:
> >    Hi Pasi
> >    I finally boot up successfully by simply modified  the kernel config
> >     item CONFIG_XEN_MAX_DOMAIN_MEMORY=32 to CONFIG_XEN_MAX_DOMAIN_MEMORY=128
> >    (just choose a random value >72 ),
> >    then rebuild the kernel-2.6.32 , and everything is ok.
> >    By the way, i 've done many test and i finally found that
> >    if unallocated memory(total - dom0 ) >32GB, boot up would be failed in my
> >    environment.
> >    for example, after I modified the kernel config, hypervisor boot normally
> >    and dom0 get 72GB.
> >    If i add dom0_mem= 32G(unallocated 40G) to grub option, hypervisor boot
> >    fail again,
> >    and if dom0_mem= 41G(unallocated 31G), hypervisor boot normally again.
> >    So , might it be a problem of xen-4.0 that unable to handle unallocated
> >    memory >32GB?
> >
> 
> Sounds like a bug yeah.. How does it fail in the dom0_mem=32G case? What's 
> the error? 
> 
> Can you please paste the full bootlog of the failing boot from a serial 
> console? 
> http://wiki.xensource.com/xenwiki/XenSerialConsole
> 

Oh, one more thing, could you also try with Xen 4.0.1-rc6? 

Thanks!

-- Pasi

> 
> 
> >    Regards,
> >    Ben
> >    2010/8/12 Pasi Kärkkäinen <[1]pasik@xxxxxx>
> > 
> >      On Thu, Aug 12, 2010 at 03:08:25PM +0800, benian wrote:
> >      >
> >      >
> >      >    My environment is xen-4.0.0 + pvops2.6.32 kernel + fedora12
> >      >
> >      >    I can run xen hypervisor smoothly when system memory below 64G
> >      >
> >      >    But if I plug 4GB more memory to my server, XEN hypervisor start
> >      fail then
> >      >    crash and restart automatically.
> >      >
> >      >    The final screen is some message about memory address which will
> >      not be
> >      >    displayed in normal process
> >      >
> >      >
> >      >
> >      >    I read from XEN 4.0.0 features that Xen support 1 TB of RAM per
> >      host, so I
> >      >    am not sure what *s wrong with this situation.
> >      >
> >      >
> >      >
> >      >    Any idea is appreciated and welcome
> >      >
> >      >
> > 
> >      How much memory does your dom0 have? ie. what's your dom0_mem= option
> >      for xen.gz in grub.conf.
> >      Have you tried different values? ie. 2GB, 4GB, 8GB?
> > 
> >      Also setup a serial console so you can figure out if it's the Xen
> >      hypervisor or dom0 kernel crashing:
> >      [2]http://wiki.xensource.com/xenwiki/XenSerialConsole
> > 
> >      and more info about troubleshooting pvops dom0 kernels (also an example
> >      about serial console with pvops dom0):
> >      [3]http://wiki.xensource.com/xenwiki/XenParavirtOps
> > 
> >      Those should help.
> >      -- Pasi
> > 
> > References
> > 
> >    Visible links
> >    1. mailto:pasik@xxxxxx
> >    2. http://wiki.xensource.com/xenwiki/XenSerialConsole
> >    3. http://wiki.xensource.com/xenwiki/XenParavirtOps
> 
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